Duny a



(No Model.)

D. AQSC'HUTT. INGANDBSGBNT LAMP SOCKET. N0. 595,584. Patented 'Da c.14,1897.

Vgl/, A@12o Wnesses.- y,

Y terveni'ng revolving current-shifting ring B.

PATENT DUNY A. SCHUTT, OF PERU, INDIANA,'ASSIGNOR TO THE PERU ELECTRICyMANUFACTURING COMPANY, OF SAME PLACE.

INCANDESCENT- SPECIFICATION' forming part of Letters Patent No. 595,584,dated December 14, 1897.

Application led April 16, 1 8 9 7.

To a/ZZ whom it may concern: v

Be it known that I, DUNY A. SCHUTT, acitizen of the United States,residing at Peru, in the county of Miami and State of Indiana, haveinvented or discovered a new and useful Improvement in Sockets, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this application, inwhich- Figure 1 is a view in perspective of my improved socket. Fig. 2is a central vertical section thereof. Fig. 3 is an under plan view ofthe center revolving ring, the central connecting-post being shown insection. Fig. 4 is a detail view in perspective showing. the upper partof the ring. Fig. 5 is a perspective detail of the lower stationarybasev and the central springs detached. Fig. 6 is a detail view inperspective of the central connecting-post. Fig. 7 is-a sectional detailview showing the limiting-stop. Fig. 8 is a View similar to Fig. 3,illustrating a modiiied construction of contact-springs.

My invention consists of an improvement in sockets for incandescentlamps, made of porcelain or other insulating material, constructed ofthree main parts. and the various connections .and contact-terminals andis design ed to operate to open or close a circuit by turning the middlepart. Heretofore sockets for this purpose have been composed entirely orin part of metal, which is liable to make short circuits or becomeheated and cannot be used in an atmosphere charged with acids or salts.By the use of a porcelain socket I obviate these difficulties and securea serviceable and reliable Vsocket at a reasonable cost.

Referring to the drawings, the socket is composed of an uppersecuring-base portion A, a lower lamp-receiving base C, and an in- Theupper and lower bases are held rigidly together and in a fixed relationto each other by a square post 2, secured to the upper securingbase by ascrew 3 and to the lower by a screw 4, provided with an enlargedthreaded head 5, upon which the base of the lamp is screwed and whichconstitutes one of the terminals of the circuit. The other terminal,

when the circuit is closed, is a screw 6, the

semi ro. 632,437, (No model.)

head of which extends into the cavity 7 of the lower base C and bears onthe end of the lamp, as indicated in dotted lines. A similar screw 8 isinserted at the opposite side to equalize pressure.

To the upper face of the base C is secured by the screw 6 thecontact-spring 9, turned over in a hook shape, so as-to insure a rubbingcontact.

The center ring B has secured to properlyshaped bosses,on their underside,the contactsprings 10 11, held in position by screws 12, passingthrough the porcelain bosses and into securing conducting-plates 13,supplied with binding-screws 14, to which are attached the ends ofcurrent-wires 15.

The spring 10 is turned around and elnbraces a reduced rounded portion16 of the post 12, with which, and consequently with the screw 5,isalways maintained an electrical connection from one of the wires 15. Thespring 1l projects downwardly and in one position of the revolvingcenter ring B makes electrical contact with the contact-spring 9,thereby closing the circuit and establishing a current through the lamp.

When the ring B is reversed, the spring 11 is withdrawn from contact andthe circuit is broken. l

It will be seen that the ring Bis free to turn between the upper andlower bases, and I have provided a limiting-stop 17, projecting upwardlyfrom the edge of the ring vand into a recess 18, having shoulders 19 ateach end against which the stop 17 abuts to limit vthe rotation of thering, the shoulders being so located as to allow sufficient motion ofthe ring to make and break the circuit.

The edge of the ringBis knurled, as shown, to facilitate turning and toindicate the operation.

The upper securing-base is hollow, so as to allow the wires to beintroduced to the binding-screws, and it is supplied at the top with ascrew-threaded bush 2O for attachment to a chandelier or elsewhere, thebush being secured in position by a screw 21.

'In Fig. 8 I have shown a modified construe tion in which the spring 10has a constant rubbing contact on a pin 22 of the post 2, and such andother varia\tions in the manner of lses IOO

making contact with the post I consider as within the scope of myinvention.

B y my improved construction I am enabled to dispense with the use of akey and have secured an extremely neat and serviceable device for theobjects in view.

It will be observed that the parts extend over and make a close joint,thereby preventing entrance of moisture, as when exposed to the Weather,in mines, &c. The socket is so designed that it may be used with aflexible connection through the bush 20, if desired, the socket in suchcases hanging pendent.

Changes may be made by the skilled mechanic Within the scope of myinvention, and I desire to include all such as equivalents of myconstruction.

IVhat I claim is- 1. A three-part socket composed of insulating materialcomprising a hase provided With a securing-bush, a lamp-socket, a rigidmetallic intervening connecting-post, and an intervening movable knurlededge shifting ring provided With wire connections, and contact-springsarranged to make electrical connection with terminals in thelamp-socket, snbstan tially as set forth.

2. Athree-part socketcomposed of insulating material comprising asecuring-base, a lamp-receiving socket, a rigid metallic interveningconnecting-post provided with means for attachment of a lamp within thesocket comprising a normally-closed terminal, and

a terminal mounted in the socket designed to contact with the base of alamp, with an intervening movable shifting ring provided with bindingattachments for circuit-Wires, and contact-springs for transmitting thecurrent to the terminals, substantially as set forth.

3. In a three-part socket composed of insulating material, a rigidmetallic intervening post connecting the securing-base with thelamp-socket, provided with a threaded securing-screw in the lamp-socketfor attachment of the lamp, and a contact-spring secured to theintervening movable ring and embracing a rounded portion of the post,substantially as set forth.

4. In a three-part socket composed of insulating material comprising asecuring-base and a lamp-socket held together by a rigid metallicintervening connecting-post and an intervening movable shifting ringprovided With a contact-sprin g in engagement with the post; aprojection 011 the ring and a corresponding recess in the base providedwith abutting ends for limiting the movement of the ring, substantiallyas set forth.

In testimony whereof I have hereunto set my hand this 27th day ofJanuary, 1897.

DUNY A. SCHU'IT.

XVitnesses:

WM. B. MCCLINTIC, NoTT N. ANTRIM.

